Container for storing a liquid, pressure valve therefor and use of the container as a beer barrel; method for controlling the pressure in a container of this type; hollow container base, modular system for producing a hollow container base and method for filling a container

A container for storing beer, comprising a fill chamber, a pressure chamber, and a pressure valve,

• wherein:
• the fill chamber, having a first pressure and filled with the beer, is formed by a container base configured for supporting the container on a surface, a container wall extending from the container base toward a container upper face, a z-axis extending from the container base to the container upper surface;
• the pressure chamber, having a second pressure, is formed by the container base and a pressure chamber base;
• the pressure valve is connected to the container base and the pressure chamber base;
• the pressure valve, when open, establishes fluid communication between the fill chamber and the pressure chamber, and the pressure valve, when closed, separates the fill chamber and the pressure chamber in a fluid-tight manner from one another;
• and a lower end of a discharge line located in the fill chamber is, with respect to the z-axis, not located above the pressure valve;
• wherein:
• an inner end section of the discharge line is located in the fill chamber;
• and
• the container base is configured to be dome-shaped or curved towards the fill chamber at least in an inner area of the container base, the inner area of the container base being above an outer portion of the container base adjacent the wall.